Abstract: In today’s modern world, international customs offices have found their importance in standardization of customs rules and regulations in order to facilitate trading and business. These days, various services such as: electronic government, electronic services, electronic customs, electronic business and trading and so on are available to facilitate different affairs and to improve people’s welfare and comfort. Standardization is done through applying automation, re-structuring, analyzing risk factors and avoiding possible damages in everyday activities. Standardization of processes in different places and using it regularly establishes an efficient management which is one of the key factors in effective business and trading. In addition by presenting a new model in accordance with the present condition of the organization, we are going to discover the closest standardization of time clearance processes model and affective factors on them. The proposed study uses factor analysis to extract the most influencing factors and the sample size has been chosen from customs expertsin Tehran. The questionnaire was designed in Likert scale and distributed among 311customs managers and experts in Tehran. Cronbach alpha is calculated as 0.79 for standardization of processes and 0.77 for time clearance which is well above the minimum desirable limit of 0.70. In this study 36 variables recognized which seven factors were extracted. These four factors are related to the standardization of processes: system structure, procedure, process, the rules and three factors of time clearance include: risks, customs procedures, electronic procedures. Critical component of standardization of time clearance processes based on structural equation is the most important factor in risks (by a factor of 99%), electronic procedures (by a factor of 96%) and system structure (by a factor of 94%), respectively the second and third priorities which can be considered the custodians of this section.